I'd look in the Divine RPG config & look for anything called a ladder, then change that to an open ID. This looks like a crash report with block IDs, so 795 & 796 should be the numbers you need to change. A quick google shows there may be 2 different Divine RPG items that act like ladders, so those might be your problem. For a simple solution, I just pick a mod I will never install from the universal configs & use the #s from that for the mod I'm trying to add.
